\textbf{174.} According to the figure below, a light ray enters medium (2) from medium (1). The wavelength of light in medium (2) is how many times the wavelength of light in medium (1)?
\textit{[Figure: Light ray passing from medium $n_1$ to medium $n_2$; angle of incidence $60°$ and angle of refraction $15°$ are shown; normal line indicated.]}
\begin{center}
(1) $\sqrt{2}$ \\[4pt]
(2) $\dfrac{\sqrt{3}}{2}$ \\[4pt]
(3) $2$ \\[4pt]
(4) $\dfrac{1}{2}$
\end{center}
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